[SimplifyLibcalls] Realloc(null, N) -> Malloc(N)
Patch by Dávid Bolvanský!
Differential Revision: https://reviews.llvm.org/D45413
llvm-svn: 330259
diff --git a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
index 24af7c4..7de2c1c 100644
--- a/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
+++ b/llvm/lib/Transforms/Utils/BuildLibCalls.cpp
@@ -1037,3 +1037,40 @@
CI->setCallingConv(Fn->getCallingConv());
return CI;
}
+
+Value *llvm::emitMalloc(Value *Num, IRBuilder<> &B, const DataLayout &DL,
+ const TargetLibraryInfo *TLI) {
+ if (!TLI->has(LibFunc_malloc))
+ return nullptr;
+
+ Module *M = B.GetInsertBlock()->getModule();
+ LLVMContext &Context = B.GetInsertBlock()->getContext();
+ Value *Malloc = M->getOrInsertFunction("malloc", B.getInt8PtrTy(),
+ DL.getIntPtrType(Context));
+ inferLibFuncAttributes(*M->getFunction("malloc"), *TLI);
+ CallInst *CI = B.CreateCall(Malloc, Num, "malloc");
+
+ if (const Function *F = dyn_cast<Function>(Malloc->stripPointerCasts()))
+ CI->setCallingConv(F->getCallingConv());
+
+ return CI;
+}
+
+Value *llvm::emitCalloc(Value *Num, Value *Size, const AttributeList &Attrs,
+ IRBuilder<> &B, const TargetLibraryInfo &TLI) {
+ if (!TLI.has(LibFunc_calloc))
+ return nullptr;
+
+ Module *M = B.GetInsertBlock()->getModule();
+ const DataLayout &DL = M->getDataLayout();
+ IntegerType *PtrType = DL.getIntPtrType((B.GetInsertBlock()->getContext()));
+ Value *Calloc = M->getOrInsertFunction("calloc", Attrs, B.getInt8PtrTy(),
+ PtrType, PtrType);
+ inferLibFuncAttributes(*M->getFunction("calloc"), TLI);
+ CallInst *CI = B.CreateCall(Calloc, {Num, Size}, "calloc");
+
+ if (const auto *F = dyn_cast<Function>(Calloc->stripPointerCasts()))
+ CI->setCallingConv(F->getCallingConv());
+
+ return CI;
+}